use the same tests template in both prerelease and test

The code is fully duplicated in both files when in the end only one ENV variable is changed. It should rely on the same template or at list call the tests.yml in both workflows. 

food for thoughts as passing env variable is trickier than expected: 
https://stackoverflow.com/questions/73305126/passing-env-variable-inputs-to-a-reusable-workflow
